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Primer for semi-exposed steel

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bcchurch

Joined: 10 Dec 2007
Posts: 25
Location: Racine, WI

Posted: Wed Mar 19, 2008 3:01 pm Post subject: Primer for semi-exposed steel

Please - remain calm and let's not start a primer war. 



With winter in Wisconsin starting to break, I finally got started on my 801 kit and have the elevator skeleton ready to rivet.  I'm using PTI Zinc Oxide for the aluminum but was unsure about what to do for the elevator outboard hinge pin 8H3-2.  This part is steel and will be in direct contact with the outboard tip rib.  I'd like some advice from the group about how to corrosion protect in this situation.  Is a simple self-etching primer for the steel hinge pin sufficient?   Does it need something more?   I've read some postings from the archives but nothing seemed to address this situation.



Thanks,

Ben

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Ben Church
CH801
Racine, WI

Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Wed Mar 19, 2008 4:28 pm Post subject: Re: Primer for semi-exposed steel

I'm building a XL so I'm not familiar with the hinge you describe.  If it is in a moving hinge then pretty much anything you put on it will get scraped off eventually.  Self-etching primer typically will not prevent rusting unless topcoated with enamel or the like.   It might be a case where something like ACF-50 would be a good choice. It lubricates and protects against corrosion (see http://www.corrosion-control.com/acf50.html)



Tim

Do not archive

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CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

av8or(at)cox.net
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Posted: Wed Mar 19, 2008 4:28 pm Post subject: Primer for semi-exposed steel

I prefer powder coating all steel parts.   Easy to do (or have done).  Then you can paint to a finish coat color if  needed (ie. exposed).

  

 JT

 [quote]   ---

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psm(at)ATT.NET
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Posted: Thu Mar 20, 2008 8:21 pm Post subject: Primer for semi-exposed steel

If the information I learned about powder coating is accurate, then using this process in the engine compartment of an airplane is close to suicidal.



 When I attended an EAA chapter meeting at a powder coating company, I learned this process is mostly a way to get polyurethane paint on stuff.  I also know that polyurethane produces Hydrogen Cyanide when burned.  This is the stuff many states used for many years to execute people.  It is incredibly poisonous.  To put this material in an engine compartment where there are FIRES seems like the epitome of foolish moves.



 Paul

 XL fuselage



 

 At 05:28 PM 3/19/2008, you wrote:

 [quote]I prefer powder coating all steel parts.  Easy to do (or have done).  Then you can paint to a finish coat color if needed (ie. exposed).

  

 JT[b]

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planecrazydld(at)yahoo.co
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Posted: Fri Mar 21, 2008 3:40 am Post subject: Primer for semi-exposed steel

one of the reasons that engine mounts were routinely painted with ZCP was to allow easy detection of cracks very early in their growth. The more finish, usually, the more ductile the coating and the slower a crack fractures the coating...



Paul Mulwitz <psm(at)att.net> wrote:[quote]   If the information I learned about powder coating is accurate, then using this process in the engine compartment of an airplane is close to suicidal.



 When I attended an EAA chapter meeting at a powder coating company, I learned this process is mostly a way to get polyurethane paint on stuff.  I also know that polyurethane produces Hydrogen Cyanide when burned.  This is the stuff many states used for many years to execute people.  It is incredibly poisonous.  To put this material in an engine compartment where there are FIRES seems like the  [quote][b]

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